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Penetration kinetics of PrV-ΔgLPass. The kinetics of penetration of PrV-1112, PrV-ΔgLPass, PrV-ΔgLBsp, and PrV-ΔgLPassgC+ into Vero cells were analyzed by low-pH inactivation. Indicated is the percentage of PFU which was resistant against treatment with pH 3.0 citrate buffer compared to a phosphate-buffered saline-treated control at different times after the temperature shift. Averages and standard deviations from three independent experiments are indicated.
